<?php

/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Gdata
 * @subpackage Gdata
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: HttpAdapterStreamingSocket.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Http_Client_Adapter_Socket
 */
require_once 'Zend/Http/Client/Adapter/Socket.php';

/**
 * Extends the default HTTP adapter to handle streams instead of discrete body
 * strings.
 *
 * @category   Zend
 * @package    Zend_Gdata
 * @subpackage Gdata
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Gdata_HttpAdapterStreamingSocket extends Zend_Http_Client_Adapter_Socket {
	
	/**
	 * The amount read from a stream source at a time.
	 *
	 * @var integer
	 */
	const CHUNK_SIZE = 1024;
	
	/**
	 * Send request to the remote server with streaming support.
	 *
	 * @param string        $method
	 * @param Zend_Uri_Http $uri
	 * @param string        $http_ver
	 * @param array         $headers
	 * @param string        $body
	 * @return string Request as string
	 */
	public function write($method, $uri, $http_ver = '1.1', $headers = array(), $body = '') {
		// Make sure we're properly connected
		if (! $this->socket) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception ( 'Trying to write but we are not connected' );
		}
		
		$host = $uri->getHost ();
		$host = (strtolower ( $uri->getScheme () ) == 'https' ? $this->config ['ssltransport'] : 'tcp') . '://' . $host;
		if ($this->connected_to [0] != $host || $this->connected_to [1] != $uri->getPort ()) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception ( 'Trying to write but we are connected to the wrong host' );
		}
		
		// Save request method for later
		$this->method = $method;
		
		// Build request headers
		$path = $uri->getPath ();
		if ($uri->getQuery ())
			$path .= '?' . $uri->getQuery ();
		$request = "{$method} {$path} HTTP/{$http_ver}\r\n";
		foreach ( $headers as $k => $v ) {
			if (is_string ( $k ))
				$v = ucfirst ( $k ) . ": $v";
			$request .= "$v\r\n";
		}
		
		// Send the headers over
		$request .= "\r\n";
		if (! @fwrite ( $this->socket, $request )) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception ( 'Error writing request to server' );
		}
		
		//read from $body, write to socket
		$chunk = $body->read ( self::CHUNK_SIZE );
		while ( $chunk !== FALSE ) {
			if (! @fwrite ( $this->socket, $chunk )) {
				require_once 'Zend/Http/Client/Adapter/Exception.php';
				throw new Zend_Http_Client_Adapter_Exception ( 'Error writing request to server' );
			}
			$chunk = $body->read ( self::CHUNK_SIZE );
		}
		$body->closeFileHandle ();
		return 'Large upload, request is not cached.';
	}
}
